What's That Noise? How to Tell If It's Mice, Squirrels, or Just Your House Settling

You are finally relaxing at home when suddenly you hear scratching in the ceiling.

A few minutes later, there is a thump inside the wall.

Then another noise comes from the attic.

Is it mice?

Squirrels?

Raccoons?

Or is your house simply making normal settling noises?

This is one of the most common concerns among homeowners across Toronto, Markham, Richmond Hill, Vaughan, North York, Scarborough, Mississauga, and Brampton.

The good news is that different noises often leave different clues. Understanding these clues can help you determine whether you need pest control, wildlife removal, or simply some peace of mind.

Why Houses Make Noise

Before assuming the worst, remember that every house makes some level of noise.

Especially in Canada, where temperatures can swing dramatically between seasons, building materials expand and contract throughout the year.

Common causes of normal house noises include:

• Wood framing expansion and contraction
• HVAC duct movement
• Roof truss movement
• Floor joist shifting
• Temperature changes
• Wind pressure
• Plumbing pipes expanding

These sounds are usually:

✅ Short

✅ Random

✅ Inconsistent

✅ Not associated with movement

If the noise happens once or twice and then disappears, it may simply be the house settling.

Signs You Might Have Mice

Mice are among the most common pests found in GTA homes.

They are small, lightweight, and highly active at night.

Typical mouse noises include:

Scratching

Light scratching inside walls or ceilings.

Scurrying

Fast, rapid movement sounds.

Chewing

Small repetitive gnawing noises.

Activity Timing

Usually between:

• 10 PM – 5 AM
• After lights are turned off
• During quiet periods

Mice rarely make loud banging sounds.

If the noise sounds delicate and quick, mice are often the culprit.

Signs You Might Have Squirrels

Squirrels are much larger than mice and make significantly more noise.

They commonly enter:

• Attics
• Roof spaces
• Soffits
• Vent openings

Typical squirrel noises include:

Running

Sounds like someone running across the ceiling.

Jumping

Sudden thumps or impacts.

Rolling Objects

Sometimes sounds as if a ball is rolling overhead.

Activity Timing

Most active:

• Early morning
• Shortly after sunrise
• Late afternoon

Unlike mice, squirrels are generally active during daylight hours.

If you hear loud movement at 7 AM, squirrels become much more likely.

Signs You Might Have Raccoons

Many Toronto homeowners mistake raccoons for squirrels.

However, raccoons are much larger and heavier.

Common raccoon sounds:

Heavy Footsteps

Sounds like a small child walking in the attic.

Loud Thumps

Strong impacts on the roof or ceiling.

Dragging Sounds

Slow movement or objects being dragged.

Vocal Noises

Sometimes:

• Chattering
• Growling
• Crying sounds (especially during nesting season)

Activity is usually:

• Evening
• Overnight
• Early morning

If the noise sounds surprisingly heavy, raccoons are often the reason.

Could It Be Birds?

Birds frequently enter:

• Roof vents
• Soffits
• Exhaust openings

Bird-related sounds include:

• Fluttering
• Pecking
• Chirping
• Wing flapping

Bird noises are usually concentrated around:

• Sunrise
• Morning hours

If the sound resembles rapid wing movement, birds may be involved.

Signs It's Probably House Settling

Many homeowners worry about animals when the house is simply reacting to temperature changes.

Settling sounds often include:

Single Pops

A sudden isolated "pop."

Creaking

Slow wood movement.

Ductwork Expansion

Metal ducts can produce loud clicking noises.

Seasonal Changes

More noticeable during:

• Winter
• Spring temperature swings
• Hot summer afternoons

These sounds generally:

• Do not move from room to room
• Do not repeat in patterns
• Do not occur every night

Slow wood movement.

Ductwork Expansion

Metal ducts can produce loud clicking noises.

Seasonal Changes

More noticeable during:

• Winter
• Spring temperature swings
• Hot summer afternoons

These sounds generally:

• Do not move from room to room
• Do not repeat in patterns
• Do not occur every night

Why Ignoring the Noise Can Become Expensive

Many homeowners wait months before investigating unusual sounds.

Unfortunately, wildlife and rodents can cause:

• Insulation damage
• Electrical wire damage
• Duct damage
• Roof vent damage
• Air leakage
• Water intrusion
• Fire risks from chewed wiring

A small issue today can quickly become a major repair project.

What Should You Do If You're Unsure?

If the sounds continue for several days:

1. Record the time they occur.
2. Note whether they happen during day or night.
3. Determine if the sound moves.
4. Check attic access points if safe.
5. Inspect soffits and roof vents from outside.
6. Contact a qualified wildlife or pest professional if activity continues.

The timing and pattern of the noise often reveal more than the sound itself.

Frequently Asked Questions

Can mice make noise during the day?

Yes, but most mouse activity occurs at night when the home is quiet.

Why do I only hear noises in winter?

Cold weather causes building materials to contract and may also drive wildlife indoors.

Can squirrels live in attic insulation?

Yes. Attics are one of the most common nesting locations for squirrels in the GTA.

How can I tell the difference between raccoons and squirrels?

Raccoons create heavier, slower sounds. Squirrels usually move quickly and are active during daylight hours.

Is house settling dangerous?

In most cases, normal settling noises are harmless. However, persistent cracking, shifting floors, or structural concerns should be inspected by a professional.

Final Thoughts

Not every strange noise means you have a pest problem.

Sometimes it's simply your home adjusting to changing temperatures.

However, consistent scratching, running, chewing, or heavy footsteps often indicate mice, squirrels, raccoons, or birds have found their way inside.

The sooner the source is identified, the easier and less expensive the solution usually becomes.

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Service Areas

Toronto

Markham

Richmond Hill

Vaughan

North York

Scarborough

Mississauga

Etobicoke

Brampton

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